642 rEOCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



are well-developed and are blackish brown, bearing a claw on each one ; 

 prolegs and anal legs grow a little and are like short protuberances. 

 The length of the full-grown larvae : the male is about 25 mm.; the 

 female is about 40 mm. 



The pupae of the females are cylindrical in shape, with both ends 

 narrowed towards the extremities, and are shining reddish brown ; 

 on the anal end there are three fine spines. They measure about 30 mm. 

 long. In the male they are purplish black : the head is slightly produced 

 forwards : wing-sheaths are short, leach'ng the posterior margin of 

 the second abdominal segment : the abdomen is paler and rather tapers 

 to the anal end, bearing many fine irregular transverse carinas which 

 •do not appear at the posterior border of each segment : each dorsal 

 segment of the abdomen near the anterior margin, bears a row of 

 many small spine-like tubercles ; the anal segment is somewhat conical 

 ju shape, bearing two rather large hooks at the apical extremity. The 

 length is about 19 mm. 



The duration of the larval stage is about from nine to ten months, 

 after which the larvae turn to pupae. The moth emerges in about 

 30 — 40 days. The whole life-cycle occupies about a year ; thus there 

 is only one occurrence in a year, and I have never found that this insect 

 appears twice in a year although the male moth or female adult is 

 found in several months. 



The food plants observed in Formosa are as follows : Acacia sp., 

 tea, camphor, cotton, grape, vine, orange, pear, Bischoffia javanica, rose, 

 Eriobotnja japonica, Psidium Guyava, Eugenia jambos, Eugenia 

 malaccensis and mulberry. 



The effective remedy is hand-picking of the caterpillars or pupae 

 or the females living in the cases during the winter time. Two Tachi- 

 nidae and one Ichneumonid have been reared from the pupae, and their 

 destructiveness is rather conspicuous in Formosa. 



No. 22. — Clania destructor, Dudg. (Taiwan-Cha-BIinoga.) 

 Tins species is also rather common throughout the island of Formosa. 

 I have formerly mis-identified it as mimiscula, Butl., but it is easily 

 distinguished from the latter by its large size, and by the two greyish 

 median stripes on the thorax, as well as by the more blackish coloirring. 

 This insect usually attacks the tea-plant and Psidium Guyava, and the 

 former is often seriously damaged by it, in February to May, so that 

 no crops can be plucked from a small area of a particular district. 



The caterpillar is yellowish brown, with the head pale yellowish 

 ornamented with many small irregular blackish brown flecks, and 

 bearing a few hairs ; the first thoracic somite in colour is similar to the 



